A third suspected organ was found at a Detroit wastewater treatment plant, officials say.

The suspected organ was found Wednesday night at the Water Resource Recovery Facility and was taken to the medical examiner’s office for further investigation, Detroit Police spokesman Dan Donakowski said.

Donakowski said they don’t know what kind of organ it is at this point and that it will have to be determined by the medical examiner.

The object was found in the wastewater screening area, a portion of the plant that filters debris before the treatment process, according to Great Lakes Water Authority spokesperson Amanda Abukhader.